Matarsal bone fixing device

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a metatarsal bone fixing device which is used for fixing and repairing a metatarsal bone, a tarsal bone and / or a phalanx after fracture, the metatarsal bone fixing device comprises an intramedullary nail and a fixing mechanism, the intramedullary nail is used for being placed into bone marrow of fracture and can be connected with a guiding and positioning piece, and the fixing mechanism is used for fixing and repairing the metatarsal bone, the tarsal bone and the phalanx. The guiding device is used for guiding the implantation position of the intramedullary nail; the intramedullary nail comprises a near end and a far end, the near end of the intramedullary nail is connected to the near end of the corresponding fracture bone marrow, the far end of the intramedullary nail is connected to the far end of the corresponding fracture bone marrow, and at least one of the near end and the far end of the intramedullary nail is provided with a first low incisura part; the fixing mechanism is used for fixing and pressurizing the intramedullary nail and the bone marrow of the fracture in multiple directions so as to facilitate fusion of the bone marrow of the fracture. According to the metatarsal bone fixing device, the surgical wound surface is reduced, the intramedullary nail can be guided, the implantation stability is improved, meanwhile, the metatarsal bone fixing device is better attached to the bone surface, and the stability of the postoperative healing process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a metatarsal fixation device. Background Art

[0002] Fractures between the metatarsal bones themselves and the tarsal bones or toes connected to them are mostly caused by heavy objects hitting the instep, rolling, and inversion sprains of the foot, or by tumors, congenital diseases, etc., which lead to various deformities in the metatarsal area, causing damage to the metatarsal bones and adjacent joints and affecting joint function.

[0003] Currently, the main methods for repairing metatarsal, tarsal or phalangeal fractures are implantation of artificial joint prosthesis or hammer toe hollow screws. Artificial joint prosthesis is expensive, and the implantation process is complicated and cumbersome, which requires high standards from the doctor performing the operation, and the treatment effect is not significant. The surgical trauma surface of the hammer toe hollow screw is large, the implant deviation is large, the postoperative recovery is slow, and the pressurization direction of its thread is limited to only one direction, so that the initial pressurization effect of the screw is good, but the pressurization effect during the healing process is poor, resulting in uneven pressure, which affects the stability of the healing of the metatarsal, tarsal or phalangeal bones.

[0004] Therefore, a metatarsal fixation device is urgently needed to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a metatarsal fixation device, which can reduce the surgical trauma surface, guide the intramedullary nail, improve the stability of the implantation, and better fit the bone surface, thereby improving the stability of the postoperative healing process.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A metatarsal fixation device is used to fix and repair fractured metatarsals, tarsal bones and / or phalanges, and the metatarsal fixation device comprises:

[0008] An intramedullary nail is used for insertion into the bone marrow of a fracture, and the intramedullary nail can be connected to a guide positioning member to guide the insertion position of the intramedullary nail; the intramedullary nail comprises a proximal end and a distal end, and at least one of the proximal end and the distal end is provided with a first low notch portion;

[0009] The fixing mechanism is used to fix and pressurize the intramedullary nail and the fractured bone marrow in multiple directions to facilitate the fusion of the fractured bone marrow.

[0010] Optionally, the fixing mechanism comprises:

[0011] A locking screw, fixedly connected to the proximal end of the intramedullary nail, the locking screw is used to fix the intramedullary nail to the fracture bone marrow;

[0012] At least two compression screws, the compression screws are positionally connected to the distal end of the intramedullary nail, and the compression screws are used to compress and fix the intramedullary nail to the fracture bone marrow;

[0013] The locking screw and at least some of the compression screws have different fixing directions, so as to compress and fix the fractured bone marrow from multiple directions.

[0014] Optionally, at least two fixing holes are formed on the outer peripheral surface of the distal end of the intramedullary nail, and the pressure screw is passed through the fixing holes and is positionally connected to the outer peripheral surface of the intramedullary nail;

[0015] A threaded hole is formed on the outer peripheral surface of the proximal end of the intramedullary nail, and the locking screw is threadedly connected to the threaded hole;

[0016] The axial directions of at least some of the threaded holes and the plurality of fixing holes are different.

[0017] Optionally, at least one of the fixing holes is an oblong hole, and the length direction of the oblong hole is the same as the axial direction of the intramedullary nail, so as to adjust the connection strength of the fusion part of the fractured bone marrow.

[0018] Optionally, the outer peripheral surface of the intramedullary nail is provided with two recesses facing each other, and the oblong hole is opened in the recesses.

[0019] Optionally, the pressure screw includes a first threaded portion, a first tapped portion and a nut, and the nut and the first tapped portion are respectively arranged at two ends of the first threaded portion along its own axial direction, and the nut is used to abut against the outer peripheral surface of the intramedullary nail to achieve a limited connection between the pressure screw and the intramedullary nail, the first threaded portion is used to be fixedly connected to the fracture bone marrow, and the first tapped portion is used to guide the pressure screw.

[0020] Optionally, the locking screw includes a second threaded portion, a second tapping portion and a tightening threaded portion, the second tapping portion and the tightening threaded portion are respectively arranged at two ends of the second threaded portion along its own axial direction, the tightening threaded portion is used to be fixedly connected to the intramedullary nail, the second threaded portion is used to be fixedly connected to the fracture bone marrow, and the second tapping portion is used to guide the locking screw.

[0021] Optionally, the compression screw and the locking screw are both provided with a second low-profile portion.

[0022] Optionally, a plurality of grooves are formed on the outer peripheral surface of the intramedullary nail.

[0023] Optionally, the intramedullary nail is provided with a guide hole along its axial direction, and the guide hole is used for passing the guide positioning piece.

[0024] Beneficial effects of the utility model:

[0025] The utility model provides a metatarsal fixation device. When installing the fractured bone marrow, firstly drill out the through hole required by the guide positioning piece, extend the guide positioning piece into the through hole, then connect the intramedullary nail with the guide positioning piece, place the intramedullary nail at the proximal end of the fractured bone marrow through the guide positioning piece and install it, then install the intramedullary nail at the distal end of the fractured bone marrow, and fix the intramedullary nail through a fixing mechanism, so as to realize the guided installation of the metatarsal fixation device, improve the accuracy of the implantation position of the intramedullary nail, and enhance the tensile strength; and the fixing mechanism fixes and pressurizes the intramedullary nail and the fractured bone marrow in multiple directions, so that it uniformly applies pressure to the fractured bone marrow, facilitates the connection between the two sections of the fractured bone marrow to be more stable, and at the same time ensures that in the healing process, the problem of instability of the fractured bone marrow healing caused by the reduction of the applied pressure will not occur, thereby improving the healing effect; and the design of the first low notch portion fits the bone surface more closely, facilitates the insertion of the intramedullary nail into the fractured bone marrow, reduces the occurrence of irritation of the surrounding soft tissues, and reduces the discomfort of the patient such as bulge, pain and itching. At the same time, the metatarsal fixation device uses an intramedullary nail for fixation and installation, which better protects the periosteum and reduces the occurrence of postoperative complications. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is an axonometric diagram of a metatarsal fixation device provided in some embodiments of the utility model in an installed state;

[0027] Figure 2 is an axonometric diagram of a metatarsal fixation device provided by some embodiments of the utility model;

[0028] Figure 3 is an exploded view of a metatarsal fixation device provided by some embodiments of the utility model;

[0029] Figure 4 is an axonometric view of an intramedullary nail provided by some embodiments of the utility model;

[0030] Figure 5 is an axonometric view of a cortical bone nail provided by some embodiments of the utility model;

[0031] Figure 6 It is an axonometric view of a locking screw provided in some embodiments of the utility model.

[0032] In the figure:

[0033] 1. Tarsal bones; 2. Metatarsal bones; 3. Phalanges;

[0034] 10. intramedullary nail; 11. guide hole; 12. fixing hole; 13. oblong hole; 14. threaded hole; 15. groove; 16. first low notch; 17. concave portion;

[0035] 20. Pressurizing screw; 21. First threaded portion; 22. First tapping portion; 23. Nut;

[0036] 30. Locking screw; 31. Second threaded portion; 32. Second tapping portion; 33. Tightening threaded portion. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] Refer to the following Figures 1 to 6 The metatarsal fixation device provided by the utility model is described in detail.

[0042] In this embodiment, the metatarsal fixation device is used to fix and repair the fractured metatarsal 2, tarsal 1 and / or phalange 3 to improve the effect of small joint fracture or correction and fusion.

[0043] It should be noted that the fractured bone marrow described below refers to the metatarsal bones 2, tarsal bones 1 and / or phalanges 3 after fracture, and the fractured bone marrow will be used in the following description.

[0044] Please refer to Figures 1 to 3 Specifically, the metatarsal fixation device includes an intramedullary nail 10 and a fixing mechanism. The intramedullary nail 10 is used to be inserted into the fracture bone marrow to better protect the periosteum. The intramedullary nail 10 can be connected to a guide positioning member to guide the implantation position of the intramedullary nail 10, so that the intramedullary nail 10 can be installed by manipulating the guide positioning member, and the insertion position of the intramedullary nail 10 can be adjusted without adding other trauma surfaces; the intramedullary nail 10 includes a proximal end and a distal end. The proximal end of the intramedullary nail 10 is connected to the proximal end of the corresponding fracture bone marrow, and the distal end of the intramedullary nail 10 is connected to the distal end of the corresponding fracture bone marrow. At least one of the proximal end and the distal end of the intramedullary nail 10 is provided with a first low notch portion 16 for adapting to smaller metatarsals 2, tarsal bones 1 and / or phalanges 3, so that the intramedullary nail 10 is easier to insert into the fracture bone marrow, and reduces the occurrence of irritation of surrounding soft tissues, and reduces the discomfort such as bulging, pain and itching caused by patients. Furthermore, the fixing mechanism is used to fix and pressurize the intramedullary nail 10 and the fractured bone marrow in multiple directions to facilitate the fusion of the fractured bone marrow.

[0045] Optionally, the guide positioning member may be a structure such as a Kirschner wire, which has a small trauma surface and is easy to position and fix.

[0046] The metatarsal fixation device in this embodiment, when installing the fractured bone marrow, first drill out the through hole required by the guide positioning piece, extend the guide positioning piece into the through hole, then connect the intramedullary nail 10 with the guide positioning piece, place the intramedullary nail 10 at the proximal end of the fractured bone marrow through the guide positioning piece and install it, then install the intramedullary nail 10 at the distal end of the fractured bone marrow, and fix the intramedullary nail 10 through the fixing mechanism, so as to achieve the guided installation of the metatarsal fixation device, improve the accuracy of the implantation position of the intramedullary nail 10, and enhance the tensile strength; and the fixing mechanism fixes and pressurizes the intramedullary nail 10 and the fractured bone marrow in multiple directions, so that it uniformly applies pressure to the fractured bone marrow, which facilitates the connection between the two sections of the fractured bone marrow to be more stable, and at the same time ensures that during the healing process, there will be no problem of instability in the healing of the fractured bone marrow caused by the reduction of the applied pressure, thereby improving the healing effect; and the design of the first low notch portion 16 fits the bone surface more closely, which facilitates the insertion of the intramedullary nail 10 into the fractured bone marrow, reduces the irritation of the surrounding soft tissues, and reduces the discomfort such as bulging, pain and itching caused by the patient. At the same time, the metatarsal fixation device uses the intramedullary nail 10 for fixation and installation, which better protects the periosteum and reduces the occurrence of postoperative complications.

[0047] Please refer to Figures 2 to 4 Optionally, the intramedullary nail 10 is provided with a guide hole 11 along its own axial direction, and the guide hole 11 is used to penetrate a guide positioning piece for connecting the intramedullary nail 10 and the guide positioning piece, so as to facilitate the positioning and guiding effect of the guide positioning piece on the intramedullary nail 10.

[0048] Furthermore, the first low notch portion 16 can be conical to facilitate the insertion of the intramedullary nail 10 into the bone marrow, while ensuring that the intramedullary nail 10 is more suitable for insertion into the smaller metatarsal bones 2, tarsal bones 1 and phalanges 3, avoiding discomfort caused by the intramedullary nail 10 passing through the metatarsal bones 2, tarsal bones 1 or phalanges 3.

[0049] In this embodiment, the fixing mechanism includes a locking screw 30 and at least two compression screws 20. The locking screw 30 is fixedly connected to the proximal end of the intramedullary nail 10, and the locking screw 30 is used to fix the intramedullary nail 10 to the fractured bone marrow to position the intramedullary nail 10; the compression screw 20 is limitedly connected to the distal end of the intramedullary nail 10, and the compression screw 20 is used to press and fix the intramedullary nail 10 to the fractured bone marrow to press and tighten the fractured bone marrow to achieve tightening and fixing the distal end of the fractured bone marrow toward the proximal end, so that the fractured bone marrow can maintain the state before the fracture, thereby improving the connection strength between the two sections of the fractured bone marrow and facilitating the subsequent healing of the fractured bone marrow.

[0050] Furthermore, the fixing directions of the locking screw 30 and at least part of the plurality of pressure screws 20 are different, so as to perform pressure fixation on the fractured bone marrow from multiple directions; that is, the fixing direction of the locking screw 30 is different from at least part of the fixing directions of the pressure screws 20, so as to achieve pressure fixation on the fractured bone marrow in multiple directions, apply pressure evenly, and achieve continuous pressure on the fractured bone marrow by the metatarsal fixation device during the healing process, thereby ensuring the stability of the metatarsal fixation device during use and improving the healing stability of the fractured bone marrow.

[0051] Specifically, at least two fixing holes 12 are provided on the outer peripheral surface of the distal end of the intramedullary nail 10, and the pressure screw 20 is inserted into the fixing hole 12 and is limitedly connected to the outer peripheral surface of the intramedullary nail 10; a threaded hole 14 is provided on the outer peripheral surface of the proximal end of the intramedullary nail 10, and the locking screw 30 is threadedly connected to the threaded hole 14; the axial directions of the threaded hole 14 and at least part of the several fixing holes 12 are different, thereby achieving different fixing directions of at least part of the locking screw 30 and the several pressure screws 20, so as to pressurize and fix the fractured bone marrow from multiple directions.

[0052] Optionally, at least one of the fixing holes 12 is an oblong hole 13, and the length direction of the oblong hole 13 is the same as the axial direction of the intramedullary nail 10, so as to adjust the connection strength of the fusion part of the fractured bone marrow. That is, after the locking screw 30 fixes the proximal end of the intramedullary nail 10 at the proximal end of the fractured bone marrow, one of the pressure screws 20 is inserted into the oblong hole 13, and by adjusting the distance between the end of the pressure screw 20 in the oblong hole 13 and the proximal end of the fractured bone marrow, the distance from the distal end of the fractured bone marrow fixed by the pressure screw 20 to the proximal end of the fractured bone marrow is achieved, so that the cross section of the fractured bone marrow can maintain the same state as before the fracture, and maintain the connection strength of the fusion part of the cross section of the fractured bone marrow until the fusion part formed by the cross section is healed.

[0053] Further optionally, the outer peripheral surface of the intramedullary nail 10 is relatively provided with two recesses 17, and the oblong hole 13 is opened in the recess 17, providing a certain accommodation space for the pressure screw 20, thereby preventing the pressure screw 20 from protruding too much from the intramedullary nail 10, thereby avoiding irritation of the surrounding soft tissues, and reducing the generation of discomfort such as bulging, pain and itching.

[0054] Furthermore, a plurality of grooves 15 are formed on the outer peripheral surface of the intramedullary nail 10. The provision of the grooves 15 gives the intramedullary nail 10 circumferential flexibility, reduces the circumferential pressure during insertion of the intramedullary nail 10, increases the contact area between the bone and the intramedullary nail 10, and better fits the bone surface.

[0055] Please refer to Figure 5 In some embodiments, the pressure screw 20 includes a first threaded portion 21, a first tapped portion 22 and a nut 23. The nut 23 and the first tapped portion 22 are respectively arranged at the two ends of the first threaded portion 21 along its own axial direction. The nut 23 is used to abut against the outer peripheral surface of the intramedullary nail 10 to achieve a limited connection between the pressure screw 20 and the intramedullary nail 10. The first threaded portion 21 is used to be fixedly connected with the fractured bone marrow, and the first tapped portion 22 is used to guide the pressure screw 20. When installing the pressure screw 20, align the pressure screw 20 with the corresponding fixing hole 12 or the oblong hole 13, extend it into the fractured bone marrow, pass through the first tapped portion 22, and then be fixedly connected with the fractured bone marrow through the first threaded portion 21, and then be limitedly connected with the intramedullary nail 10 through the nut 23, so that the distal end of the intramedullary nail 10 is fixedly connected with the distal end of the fractured bone marrow.

[0056] Please refer to Figure 6In some embodiments, the locking screw 30 includes a second threaded portion 31, a second tapping portion 32, and a fixing threaded portion 33. The second tapping portion 32 and the fixing threaded portion 33 are respectively arranged at two ends of the second threaded portion 31 along its own axial direction. The fixing threaded portion 33 is used to be fixedly connected with the intramedullary nail 10, the second threaded portion 31 is used to be fixedly connected with the fractured bone marrow, and the second tapping portion 32 is used to guide the locking screw 30. When installing the locking screw 30, the locking screw 30 is aligned with the corresponding threaded hole 14, inserted into the fractured bone marrow, drilled into the bone marrow through the second tapping portion 32, and then fixedly connected with the fractured bone marrow through the second threaded portion 31, and then fixedly connected with the intramedullary nail 10 through the fixing threaded portion 33, so that the proximal end of the intramedullary nail 10 is fixedly connected with the proximal end of the fractured bone marrow.

[0057] Optionally, both the pressure screw 20 and the locking screw 30 are provided with a second low notch portion (not shown in the figure), and the second low notch portion is arranged at the nut 23 of the pressure screw 20 or the fastening thread portion 33 of the locking screw 30, so that the parts where the pressure screw 20 and the locking screw 30 are connected to the intramedullary nail 10 are designed with low notches, thereby avoiding protruding too much from the surface of the intramedullary nail 10 and causing interference with the fracture bone marrow, thereby reducing discomfort.

[0058] Optionally, the second low cut portion can be beveled or rounded to reduce the outer circumference of the nut 23 of the pressure screw 20 and the tightening threaded portion 33 of the locking screw 30, thereby improving the adaptability of the pressure screw 20 and the locking screw 30 to the bone surface respectively.

[0059] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A metatarsal fixation device for fixing and repairing fractured metatarsals (2), tarsal bones (1) and / or phalanges (3), characterized in that: The metatarsal fixation device comprises: An intramedullary nail (10) is used for insertion into a bone marrow of a fracture, wherein the intramedullary nail (10) can be connected to a guide positioning member to guide the insertion position of the intramedullary nail (10); the intramedullary nail (10) comprises a proximal end and a distal end, and at least one of the proximal end and the distal end is provided with a first low notch portion (16); The fixing mechanism is used to fix and pressurize the intramedullary nail (10) and the fractured bone marrow in multiple directions to facilitate the fusion of the fractured bone marrow.

2. The metatarsal fixation device according to claim 1, characterized in that: The fixing mechanism comprises: A locking screw (30) fixedly connected to the proximal end of the intramedullary nail (10), the locking screw (30) being used to fix the intramedullary nail (10) to the fracture bone marrow; At least two compression screws (20), the compression screws (20) being positionally connected to the distal end of the intramedullary nail (10), and the compression screws (20) being used to compress and fix the intramedullary nail (10) to the fractured bone marrow; The locking screw (30) and at least some of the compression screws (20) have different fixing directions, so as to compress and fix the fractured bone marrow from multiple directions.

3. The metatarsal fixation device according to claim 2, characterized in that: The outer peripheral surface of the distal end of the intramedullary nail (10) is provided with at least two fixing holes (12), and the pressure screw (20) is passed through the fixing holes (12) and is positionally connected to the outer peripheral surface of the intramedullary nail (10); A threaded hole (14) is formed on the outer peripheral surface of the proximal end of the intramedullary nail (10), and the locking screw (30) is threadedly connected to the threaded hole (14); The axial directions of at least part of the threaded hole (14) and a plurality of the fixing holes (12) are different.

4. The metatarsal fixation device according to claim 3, characterized in that: At least one of the fixing holes (12) is an oblong hole (13), and the length direction of the oblong hole (13) is the same as the axial direction of the intramedullary nail (10) so as to adjust the connection strength of the fusion part of the fractured bone marrow.

5. The metatarsal fixation device according to claim 4, characterized in that: The outer peripheral surface of the intramedullary nail (10) is provided with two recessed portions (17) facing each other, and the oblong hole (13) is opened in the recessed portions (17).

6. The metatarsal fixation device according to claim 2, characterized in that: The pressure screw (20) comprises a first threaded portion (21), a first tapping portion (22) and a nut (23); the nut (23) and the first tapping portion (22) are respectively arranged at two ends of the first threaded portion (21) along its own axial direction; the nut (23) is used to abut against the outer peripheral surface of the intramedullary nail (10) to achieve a limited connection between the pressure screw (20) and the intramedullary nail (10); the first threaded portion (21) is used to be fixedly connected to the fracture bone marrow; and the first tapping portion (22) is used to guide the pressure screw (20).

7. The metatarsal fixation device according to claim 2, characterized in that: The locking screw (30) comprises a second threaded portion (31), a second tapping portion (32) and a fixing threaded portion (33); the second tapping portion (32) and the fixing threaded portion (33) are respectively arranged at two ends of the second threaded portion (31) along its own axial direction; the fixing threaded portion (33) is used for fixed connection with the intramedullary nail (10); the second threaded portion (31) is used for fixed connection with the fracture bone marrow; and the second tapping portion (32) is used for guiding the locking screw (30).

8. The metatarsal fixation device according to claim 2, characterized in that: The pressure screw (20) and the locking screw (30) are both provided with a second low-profile portion.

9. The metatarsal fixation device according to claim 1, characterized in that: The outer peripheral surface of the intramedullary nail (10) is provided with a plurality of grooves (15).

10. The metatarsal fixation device according to any one of claims 1 to 9, characterized in that: The intramedullary nail (10) is provided with a guide hole (11) penetrating along its axial direction, and the guide hole (11) is used to penetrate the guide positioning piece.

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